Efficient and environment-friendly dichloronitrobenzene wastewater treatment equipment

Abstract

The invention relates to the technical field of benzene-containing wastewater treatment, in particular to efficient and environment-friendly dichloronitrobenzene wastewater treatment equipment which comprises a premixing tank, a liquid injection pump, a stirring and distributing tank, a liquid collection pump and a benzene tank which are sequentially connected through a pipeline. A supernatant outlet and a flow inlet are formed in the side wall of the tank body, a subnatant outlet is formed in the bottom of the tank body, an outlet of the liquid injection pump is connected to the flow inlet, an inlet of the liquid collection pump is connected to the subnatant outlet, and a treatment medium continuously enters and is discharged from the stirring and shunting tank. The stirring and shunting tank further comprises a motor, a main shaft, a blade frame and paddles, the motor is mounted at the top of the tank body, the main shaft is downwards arranged on the motor, the blade frame is radially mounted on the main shaft, a plurality of paddles are arranged on the blade frame, and the flow inlet is positioned between the upper-layer liquid outlet and the lower-layer liquid outlet in height.

Description

Technical Field

[0001] The invention relates to the technical field of benzene-containing wastewater treatment, in particular to a highly efficient and environmentally friendly dichloronitrobenzene wastewater treatment device. Background Art

[0002] The treatment of dichloronitrobenzene production wastewater is a complex process. This type of wastewater contains a large amount of harmful organic matter and cannot be discharged directly. The benzene component needs to be fully degraded or separated before it can be discharged.

[0003] In the prior art, physical treatment methods such as adsorption are limited in types and treatment efficiency. Chemical methods such as the Fenton method, the strong reducing agent method, etc. have many processes and messy products, requiring a long treatment time and steps. Biological treatment methods require a large space for sufficient contact between microorganisms and wastewater. Currently, these methods cannot be further improved in treatment efficiency. Among them, the method involving the benzene water separation step mainly adopts a standing waiting method, which is time-consuming and the treatment capacity cannot be continuously improved. Summary of the invention

[0004] The purpose of the present invention is to provide a highly efficient and environmentally friendly dichloronitrobenzene wastewater treatment device to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions: A highly efficient and environmentally friendly dichloronitrobenzene wastewater treatment equipment, the treatment equipment comprises a premixing tank, a liquid injection pump, a stirring and diverting tank, a liquid collecting pump, and a benzene tank, the premixing tank, the liquid injection pump, the stirring and diverting tank, the liquid collecting pump, and the benzene tank are sequentially connected through pipelines, wherein the stirring and diverting tank comprises a tank body, an upper layer liquid outlet and an inlet are arranged on the side wall of the tank body, a lower layer liquid outlet is arranged at the bottom of the tank body, the outlet of the liquid injection pump is connected to the inlet, and the inlet of the liquid collecting pump is connected to the lower layer liquid outlet, The treatment medium continuously enters and is discharged from the stirring diversion tank.

[0006] The organic wastewater to be treated enters the premixing tank, and the treatment agent is added together with it. The main goal of the agent selection in this application is to react and eliminate the binding groups of nitrobenzene and water, so that nitrobenzene can reduce its solubility, and then produce stratification. The medium is continuously entered and exited in the stirring diversion tank, so that the treatment and diversion processes are continuous, thereby increasing the treatment efficiency of the wastewater at this stage.

[0007] The premixing tank is stirred with the drug added, and the stirring speed in the premixing tank is more than twice the stirring speed in the stirring and diversion tank.

[0008] The premixing tank is first stirred at a high speed to promote sufficient contact and reaction between the reagent and the wastewater, and then enters the mixing and diversion tank. Excessive stirring speed affects liquid stratification, so the stirring speed should be reduced. However, because the mixing and diversion tank is large, all liquid micro-clusters need to flow to the target position as much as possible and not stick to the inner wall. Therefore, there should also be a relatively low-speed stirring in the mixing and diversion tank to further produce the decomposition reaction after adding the drug in a spacious environment.

[0009] The stirring and diverting tank also includes a motor, a main shaft, a blade rack, and paddles. The motor is installed on the top of the tank body, the main shaft is arranged downward, the blade rack is radially arranged on the main shaft, and a plurality of paddles are arranged on the blade rack. The inlet is located between the upper liquid outlet and the lower liquid outlet in height.

[0010] The liquid to be separated enters the tank body from the inlet and enters the middle section. The upper layer is a fully floating clear liquid, the main component of which is water. The lower layer is a fully sinking benzene liquid, the main component of which is the reactant of dichloronitrobenzene. Depending on the different reagents added in the front, the dichloronitrobenzene product may be different, such as nitrobenzoic acid. The density of benzene liquid is greater than that of water, and it sinks to the bottom of the tank body waiting to be collected into the benzene tank. The middle layer enters the liquid to be separated, preventing the water body in the upper layer in a low flow state from being disturbed and affecting the discharge of the clear liquid from the upper liquid outlet.

[0011] A vertical groove is arranged on the outer surface of the main shaft, and the blade frame is slidably installed on the main shaft. The overall density of the blade frame and the blades is between the density of the clear liquid to be separated and the benzene liquid.

[0012] The blade frame and the blades thereon are installed in an integral floating manner, and according to the buoyancy, they accurately stay in the middle layer of the liquid for stirring. The density of the lower layer of benzene liquid is 1.4~1.6, and the density of the upper layer of clear liquid is close to 1.0 of water. Therefore, the blade frame and the blades are made of a material with a density of about 1.2 as a whole to achieve floating self-adaptation on the main shaft. The vertical groove does not affect the axial sliding and retains the transmission capacity.

[0013] The blades are movably mounted on a blade rack, and a plurality of horizontal middle rods are arranged on the blade rack. The blades are rotatably mounted on the middle rods, and the outer edges of the blades face the front of the rotation of the main shaft.

[0014] The blades are also installed in a floating manner. When the main shaft rotates, the blades face the forward medium. There are several micro-clusters in the middle layer of the tank. When the blades with a lower speed enter the benzene micro-clusters, the blades are subject to greater buoyancy, and the front end of the blades is lifted up. During the rotation process, the blades exert a downward force on the benzene micro-clusters, which promotes the sinking of the benzene micro-clusters. Similarly, when the blades encounter water micro-clusters, the buoyancy is smaller, and the front end of the blades pitches down, providing an upward force component for the micro-clusters. The pitch change of the blades promotes the upper and lower stratification of the middle layer of the tank. The linear velocity of the blades needs to be smaller to prevent the thrust of the liquid on the blades under high-speed rotation from causing the blades to flip.

[0015] Two limit stop rods are also arranged on each middle pole, and the limit stop rods are perpendicular to the middle pole and symmetrical with respect to the horizontal plane.

[0016] The limit stop bar limits the pitch angle range of the blades, and changes the angle within this range to prevent the blades from being lifted up or pitched down too much and becoming a vertical plane. If the blades become a vertical plane, the reaction force of the surrounding liquid on the blades will increase, affecting the pitch change of the blades according to the density.

[0017] The included angle of the two limit stop bars on the same center rod is 50~60°.

[0018] If the angle is too large, the spindle speed will be limited, while if the angle is too small, the proportion of the upper and lower force components for different micro-groups will be affected.

[0019] The stirring and diverting tank body is provided with high and low level gauges, the float densities of the two level gauges correspond to the upper clear liquid and the lower benzene liquid in the tank body, and the level gauges are connected with the injection pump and the liquid collecting pump by electrical signals.

[0020] Two high and low liquid level gauges are set in the tank body to sense the stratification situation in the tank body. When the overall liquid level drops rapidly, the pumping flow of the injection pump needs to be increased. When there is a lot of benzene liquid accumulated in the lower layer of the tank body, the pumping flow of the liquid collection pump needs to be increased, and vice versa.

[0021] A float valve is provided at the outlet of the upper liquid.

[0022] When the liquid level in the tank is too high, it will be discharged out of the tank, and when the liquid level is low, the tank will be isolated from the outside to prevent external air or liquid from entering.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention continuously feeds the wastewater after sufficient stirring with the addition of drugs into the stratification tank for micro-stirring and stratification, the inlet position is in the middle part and does not affect the stability of the upper and lower layers of liquid, the stirring blades are pitched forward, and different angles are used in different micro-clusters so that the micro-clusters can be subjected to different upper and lower forces, which promotes the sinking of heavy components and the floating of light components, improves the separation efficiency, and thus ensures the continuous treatment of the wastewater, otherwise it will take a long time to wait for stratification, affecting the efficiency of continuous entry and exit of materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall appearance structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the stirring and diverting tank of the present invention; Figure 3 It is a schematic diagram of the installation structure of the main shaft, blade rack and blades of the present invention; Figure 4 yes Figure 3 View A in Figure 5This is a schematic diagram of the operating principle of the blade rack and blades of the present invention; In the figure: 1. premixing tank; 2. injection pump; 3. stirring and diverting tank; 31. tank body; 311. inlet; 312. lower liquid outlet; 313. upper liquid outlet; 32. motor; 33. main shaft; 331. vertical slot; 34. blade rack; 341. middle rod; 342. limit stop rod; 35. paddle; 4. liquid collecting pump; 5. benzene tank. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] A highly efficient and environmentally friendly dichloronitrobenzene wastewater treatment equipment, the treatment equipment comprises a premixing tank 1, a liquid injection pump 2, a stirring and diverting tank 3, a liquid collecting pump 4, and a benzene tank 5, the premixing tank 1, the liquid injection pump 2, the stirring and diverting tank 3, the liquid collecting pump 4, and the benzene tank 5 are sequentially connected through pipelines, wherein the stirring and diverting tank 3 comprises a tank body 31, an upper layer liquid outlet 313 and an inlet 311 are arranged on the side wall of the tank body 31, a lower layer liquid outlet 312 is arranged at the bottom of the tank body 31, the outlet of the liquid injection pump 2 is connected to the inlet 311, and the inlet of the liquid collecting pump 4 is connected to the lower layer liquid outlet 312, The treatment medium continuously enters and is discharged from the stirring and diverting tank 3.

[0027] like Figure 1 As shown, the organic wastewater to be treated enters the premixing tank 1, and the treatment agent is added together when entering. The main goal of the agent selection in this application is to react and eliminate the binding groups of nitrobenzene and water, so that nitrobenzene can reduce the solubility, and then produce stratification, and continuously stir the medium in and out of the diversion tank to make the treatment and diversion process continuous, thereby increasing the treatment efficiency of the wastewater at this stage.

[0028] The premixing tank 1 is filled with drugs and stirred, and the stirring speed in the premixing tank 1 is more than twice the stirring speed in the stirring and diverting tank 3.

[0029] like Figure 1 , 2 As shown, the premixing tank 1 is first stirred at a high speed to promote sufficient contact and reaction between the reagent and the wastewater, and then enters the stirring and diverting tank 3. Excessive stirring speed affects liquid stratification, so the stirring speed should be reduced. However, because the stirring and diverting tank 3 is relatively large, all liquid micro-clusters need to flow to the target position as much as possible and not stick to the inner wall. Therefore, there should also be a relatively low-speed stirring in the stirring and diverting tank 3 to further produce the decomposition reaction after the addition of the drug in a spacious environment.

[0030] The stirring and diverting tank 3 also includes a motor 32, a main shaft 33, a blade rack 34, and paddles 35. The motor 32 is mounted on the top of the tank body 31. The main shaft 33 is arranged downwardly from the motor 32. The blade rack 34 is radially mounted on the main shaft 33. A plurality of paddles 35 are arranged on the blade rack 34. The inlet 311 is located between the upper layer liquid outlet 313 and the lower layer liquid outlet 312 in height.

[0031] like Figure 2 , 3 As shown, the liquid to be separated in the tank body 31 enters the middle position through the inlet 311, the upper layer is a fully floating clear liquid, the main component of which is water, the lower layer is a fully sunken benzene liquid, the main component of which is the reactant of dichloronitrobenzene. Depending on the different reagents added in the front, the dichloronitrobenzene product may be different, such as nitrobenzene acid, etc. The density of benzene liquid is greater than that of water, and it sinks to the bottom of the tank body 31 waiting to be collected into the benzene tank 5. The middle layer enters the liquid to be separated, preventing the water body in the upper layer in a low flow state from being disturbed and affecting the discharge of the clear liquid from the upper liquid outlet 313.

[0032] A vertical groove 331 is arranged on the outer surface of the main shaft 33 , and the blade rack 34 is slidably installed on the main shaft 33 . The overall density of the blade rack 34 and the blades 35 is between the density of the clear liquid to be separated and the benzene liquid.

[0033] like Figure 2 , 3 As shown, the blade rack 34 and the paddle blades 35 thereon are installed in an integral floating manner, and accurately stay in the middle layer of the liquid for stirring according to the buoyancy. The density of the lower benzene liquid is 1.4~1.6, and the density of the upper clear liquid is close to 1.0 of water. Therefore, the blade rack 34 and the paddle blades 35 are made of a material with a density of about 1.2 as a whole to achieve floating self-adaptation on the main shaft 33. The vertical groove 331 does not affect the axial sliding and retains the transmission capacity.

[0034] The blades 35 are movably mounted on the blade frame 34 . The blade frame 34 is provided with a plurality of horizontal middle rods 341 . The blades 35 are rotatably mounted on the middle rods 341 , and the outer edges of the blades 35 face the front of the main shaft 33 as it rotates.

[0035] like Figures 2~5As shown, the blade 35 is also installed in a floating manner. When the main shaft 33 rotates, the blade 35 faces the forward medium. The liquid in the middle layer of the tank body 31 has a number of microclusters. When the blade 35 with a lower speed enters the benzene microclusters, the density is ρ2. The blade 35 is subjected to a larger buoyancy, and the front end of the blade 35 is lifted. During the rotation process, the blade 35 exerts a downward component on the benzene microclusters, which promotes the sinking of the benzene microclusters. Similarly, when the blade 35 encounters a water microclusters, the density is ρ1, and the buoyancy is smaller. The front end of the blade 35 pitches down, providing an upward force component for the microclusters. The pitch change of the blade 35 promotes the upper and lower stratification of the middle layer medium in the tank body 31. The linear velocity of the blade 35 needs to be smaller to prevent the thrust of the liquid on the blade 35 under high-speed rotation from causing the blade 35 to flip.

[0036] Two limit stop rods 342 are also arranged on each middle rod 341 . The limit stop rods 342 are perpendicular to the middle rod 341 and symmetrical with respect to the horizontal plane.

[0037] like Figure 4 , 5 As shown, the limit stop rod 342 limits the pitch angle range of the blade 35, and changes the angle within this range to prevent the blade 35 from being lifted up or pitched down too much and becoming a vertical plane. If it becomes a vertical plane, the reaction force of the surrounding liquid on the blade 35 will become larger, affecting the pitch change of the blade 35 according to the density.

[0038] The two limit stop bars 342 on the same middle bar 341 have an included angle of 50-60°.

[0039] If the angle is too large, the main shaft 33 will be restricted from increasing its rotation speed, while if the angle is too small, the proportion of the upper and lower force components for different micro-groups will be affected.

[0040] The stirring and diverting tank 3 is provided with high and low level gauges. The density of the floats of the two level gauges corresponds to the upper clear liquid and the lower benzene liquid in the tank 31. The level gauges are connected with the injection pump 2 and the liquid collecting pump 4 by electrical signals.

[0041] like Figure 1 , 2 As shown, two high and low liquid level gauges are arranged in the tank body 31 to sense the stratification situation in the tank body 31. When the overall liquid level drops rapidly, the pumping flow rate of the injection pump 2 needs to be increased. When a large amount of benzene liquid accumulates in the lower layer of the tank body 31, the pumping flow rate of the liquid collection pump 4 needs to be increased, and vice versa.

[0042] A float valve is provided at the upper liquid outlet 313 .

[0043] When the liquid level in the tank body 31 is too high, the liquid is discharged out of the tank, and when the liquid level is low, the tank body 31 is isolated from the outside to prevent external air or liquid from entering.

[0044] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An efficient and environmentally friendly dichloronitrobenzene wastewater treatment equipment, characterized in that: The treatment equipment comprises a premixing tank (1), a liquid injection pump (2), a stirring and diverting tank (3), a liquid collecting pump (4), and a benzene tank (5); the premixing tank (1), the liquid injection pump (2), the stirring and diverting tank (3), the liquid collecting pump (4), and the benzene tank (5) are connected in sequence through pipelines; the stirring and diverting tank (3) comprises a tank body (31); an upper layer liquid outlet (313) and an inlet (311) are arranged on the side wall of the tank body (31); a lower layer liquid outlet (312) is arranged at the bottom of the tank body (31); the outlet of the liquid injection pump (2) is connected to the inlet (311); the inlet of the liquid collecting pump (4) is connected to the lower layer liquid outlet (312); The treatment medium continuously enters and is discharged from the stirring and diverting tank (3).

2. The highly efficient and environmentally friendly dichloronitrobenzene wastewater treatment equipment according to claim 1, characterized in that: The premixing tank (1) is stirred while adding medicine, and the stirring speed in the premixing tank (1) is more than twice the stirring speed in the stirring and diverting tank (3).

3. The highly efficient and environmentally friendly dichloronitrobenzene wastewater treatment equipment according to claim 2, characterized in that: The stirring and diverting tank (3) further comprises a motor (32), a main shaft (33), a blade rack (34), and paddles (35); the motor (32) is mounted on the top of the tank body (31); the main shaft (33) is arranged downwardly from the motor (32); the blade rack (34) is radially mounted on the main shaft (33); and a plurality of paddles (35) are arranged on the blade rack (34). The inlet (311) is located between the upper layer liquid outlet (313) and the lower layer liquid outlet (312) in height.

4. The highly efficient and environmentally friendly dichloronitrobenzene wastewater treatment equipment according to claim 3 is characterized in that: The main shaft (33) is provided with a vertical groove (331) on its outer surface. The blade rack (34) is slidably mounted on the main shaft (33). The overall density of the blade rack (34) and the blades (35) is between the density of the clear liquid to be separated and the density of the benzene liquid.

5. The highly efficient and environmentally friendly dichloronitrobenzene wastewater treatment equipment according to claim 3, characterized in that: The blades (35) are movably mounted on the blade rack (34). The blade rack (34) is provided with a plurality of horizontal middle rods (341). The blades (35) are rotatably mounted on the middle rods (341), with the outer edges of the blades (35) facing the front of the main shaft (33) when it rotates.

6. The highly efficient and environmentally friendly dichloronitrobenzene wastewater treatment equipment according to claim 5, characterized in that: Two limit stop rods (342) are also arranged on each of the middle rods (341); the limit stop rods (342) are perpendicular to the middle rod (341) and symmetrical with respect to a horizontal plane.

7. The highly efficient and environmentally friendly dichloronitrobenzene wastewater treatment equipment according to claim 6, characterized in that: The two limit stop rods (342) on the same middle rod (341) have an included angle of 50-60°.

8. The highly efficient and environmentally friendly dichloronitrobenzene wastewater treatment equipment according to claim 3, characterized in that: The stirring and diverting tank (3) is provided with a high-level and a low-level liquid level gauge. The density of the floats of the two liquid level gauges corresponds to the upper clear liquid and the lower benzene liquid in the tank (31). The liquid level gauge is connected to the injection pump (2) and the liquid collection pump (4) via electrical signals.

9. The highly efficient and environmentally friendly dichloronitrobenzene wastewater treatment equipment according to claim 8, characterized in that: A float valve is provided at the upper liquid outlet (313).

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